Anyone ever have to put in stick framed rafters in the same roof with trusses that were already installed? Just wondering about heel height?? Did you scab on 2×4’s to the top plate to match the truss?? That’s about the only solution I can think of that might work.
The situation is cut trusses on 24 in ctr and my thoughts were to stick frame rafters and c.joists in between at 12 in ctrs. Just curious about how to get the correct heel height.
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I've had to do the opposite many times - Match trusses to rafters.
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Why can't you just measure the height over the wall,a nd make your cuts to fit that?
I don't really understand what the problem is...
Boss, the problem is that the original trusses have a higher heel than then 2x8's I need to put in at 12 in ctr's. In order for me to use 2x8's at 12 in ctr, I need to raise the wall plate somehow to get the top of the 2x8 to hit the plywood, or????
The bottom chord of the truss rests on the wall plate,then it has a short 2x4 (heel)raising it up off the plate before the top chord starts. I probably could use 2x12's to make it work, but it's way overkill in this situation.
Are you putting in ceiling joists?I've seen ceiling joists ran out to a rim board that's the same depth and sits on the outside wall. Then a 2X4 plate is laid flat on top of the rim board and ceiling joists. The rafters have a seat cut that sits on the 2X4 plate. That should work if you have enough height. If it doesn't make sense let me know and I'll sketch it up.
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A sketch would help. My other thought was to run the rafter on top of the ceiling joist and gusset them together??
Here ya go:
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I've installed heel blocks with scaps thousands of times.
Bob's next test date: 12/10/07
Just run another plate, or whatever thickness you need.. Ive had to rip 3/4" plywood before to get the wall heigth the same before without having to cut 200 studs.
Building up the top plate with 2x4s to raise the heel height is very common. A few situations that come to mind are making the overhangs come out uniform on a basta.. (unequal pitch) hip roof, or another is when you have brick veneer on one side of a house.
So, it's ok to just build up the wall plate in between the trusses every 24 in?? I wouldn't have a comple plate, just 24 in scab /truss/24 in scab/ truss/etc/etc/etc??
Why are you placing a rafter between every 2' oc truss? Are you cutting into the trusses for some reason?
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Edited 3/6/2008 8:02 pm ET by Riversong
Trusses were alreadt cut into, just thought this would be the easiest fix.
I didn't catch that you were trying to basically replace the trusses. I had it in my head that you were adding onto the end of the building. How much have the trusses been altered? It may be easier to repair them than re-frame the whole roof.
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To add to what Boss said, attached are some pics of a typical truss repair. In this instance the framers just scabbed a 2x4 on with some glue and nails and kept on going. Then a HI saw it and made a BFD out of it. I think it was more just that he was so proud that he had possibly earned his keep. Got a stamped letter from the truss company which said to put a 2x4 on the other side too. Belt and suspenders approach, although IIRC the glue wasn't called for but we put it anyway. No prob. The typical BTer would have used SS screws and PL400 :-) The floor sheathing was added to either side of the joint because the truss plate was slightly loose. You can see that in the first pic. Another BFD.
If you don't mind me suggesting, as many Qs you have had lately on roof framing - I'd like suggest you go buy a book. One that comes to mind is Roof Cutters Secrets although I don't own that one so can't really endorse it. Another one that I do have is Roof Framer's Bible although that one doesn't go into the theory much. It's really just a book of tables and explains the basics in a very succinct manner. I'm sure other's here could recommend something... Granted though, a book probably won't answer Qs about truss repairs - that's done by the truss mfg although the building up of the plates would be covered.
Edited 3/8/2008 9:01 am ET by Matt